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| 摘要: |
| 状态估计是能量管理系统(EMS)的主要软件,它是高级应用软件实现的基础。针对几种主流估计算法(如基本加权最小二乘估算法)收敛性虽好,但对大型电力系统存在计算时间长、内存占用大等缺陷的问题,着重介绍了福建省电网所用状态估计算法。简述了状态估计程序及模块的生产运行概况、遥测/遥信量的控制手段、可疑数据的来源以及导致状态估计合格率下降的原因。对生产中存在的参数、变压器分接头估计误差大及对坏数据缺乏分析手段等问题进行分析并给出相关理论解释,提出了增加或完善几种量测量(厂用电、发电机端电压、变压器抽头等)提高状态估计模块精度和性能的若干具体改进建议。探讨了不良数据的检测与辨识、外网等值、权值定义原则、内部不可观测部分的处理、可观测性分析以及参数的估计与辨识这些在状态估计模块实用化中值得关注的6个关键问题,且针对各子问题所用方法进行了分析比较并给出了结论,最后对该领域的几个难点、热点研究方向进行了总结和展望。 |
| 关键词: 电力系统,状态估计,能量管理系统 |
| DOI： |
| 分类号:TM73 |
| 基金项目: |
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| Operation and practicability of state estimation module in EMS |
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LIU Feng
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| Abstract: |
| SE(State Estimation) is the main analysis software of EMS(Energy Management System) and also is the basis of advanced application software.Several main ES algorithms(e.g.the least square method with basic weight) have good convergence,but endure disadvantages of long computing time,heavy memory usage and so on for large power systems.An applied fast decoupled algorithm is introduced.The operation survey of SE module,the control of telemetering and telesignalling,the origin of suspicious data and factors influencing the eligible rate of SE are described.The great estimation errors existing in parameters and transformer tap changers and the lack of bad data analysis approaches are analyzed and the relative theoretical explanations are provided.Advices about adding or improving measurements,such as the plant electricity,generator terminal voltage and transformer tap position,are presented to enhance the ES precision.Six key problems in practicability are discussed:the detection and identification of bad data,the external network equivalence,the definition principle of measurement weight,the settlement of internal unobservable section,the observability analysis and the parameter identification and estimation.Countermeasures are compared and concluded.The hot and difficult research fields of SE are also prospected. |
| Key words: power system,state estimation,energy management system |
